Now there is such a variety of fruits in fruit trees that it is beyond all expression; a variety not only in the fruits of trees of different families, but even in those of the same species, if it be true, as gardeners say, that the sex of a tree influences the character of its fruits.  They distinguish male from female in palms; sometimes we see those which they call female lower their branches, as though with passionate desire, and invite the embraces of the male.  Then, those who take care of these plants shake over these palms the fertilizing dust from the male palm-tree, the psen as they call it:  the tree appears to share the pleasures of enjoyment; then it raises its branches, and its foliage resumes its usual form.  The same is said of the fig tree.  Some plant wild fig trees near cultivated fig trees, and there are others who, to remedy the weakness of the productive fig tree of our gardens, attach to the branches unripe figs and so retain the fruit which had already begun to drop and to be lost.  What lesson does nature here give us?  That we must often borrow, even from those who are strangers to the faith, a certain vigour to show forth good works.  If you see outside the Church, in pagan life, or in the midst of a pernicious heresy, the example of virtue and fidelity to moral laws, redouble your efforts to resemble the productive fig tree, who by the side of the wild fig tree, gains strength, prevents the fruit from being shed, and nourishes it with more care.